refactor(Core): apply clang-tidy modernize-use-override (#3817)

src/common/Database/Implementation/CharacterDatabase.h

@@ -18,7 +18,7 @@ public:
     CharacterDatabaseConnection(ACE_Activation_Queue* q, MySQLConnectionInfo& connInfo) : MySQLConnection(q, connInfo) {}
 
     //- Loads database type specific prepared statements
-    void DoPrepareStatements();
+    void DoPrepareStatements() override;
 };
 
 typedef DatabaseWorkerPool<CharacterDatabaseConnection> CharacterDatabaseWorkerPool;